What is the common deference of an Ap . In which a21_a7=84
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a21-a7=84(given)
then
a+20d-a-6d=84
14d=84
d=84/14
d=6 .....ans
hope it helpful
Nimai7:
Why you have taken -6d
because of minus sign
-(a+6d)
now you open this bracket
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